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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0369704800db52a800e10d08b6a54719a2d53e7a9678b823c86363ef2aaf5360' 
  AND token = 'ByHPg3BL648g21T4nQK1ypdshxhURTKEsFHlEqzx9oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}